RATE COMPENSATING TRACKER WOX-2A
NAVAL ORDNANCE LAB WHITE OAK MD
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An automatic tracker was built to follow the position of the maximum of a correlation function generated by a DELTIC correlator. The positioncorrecting decisions, made for each successive correlogram, are of a fixed size 0.8 microsec the direction is determined by the polarity of the error signal formed by comparing the tracker position with the position of the new correlogram. This is similar to the WOX-1A tracker, except that the WOX- 2A is digital. This tracker includes a rate tracking capability so that a correlogram whose position changes at a constant rate up to 28.2 microsecsec may be tracked without lag. A direct readout of the correlogram rate of change of position is provided. Theoretical analysis shows that with such rate compensation the tracker performance approximates that of the uncompensated tracker for input standard deviations up to about 300 microsec, in addition to eliminating the lag. Beyond that, the tracker output variations increase and there is some tendency to oscillate.
- Statistics and Probability